1 /* 2 * Copyright (c) 1998, 2019, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_PRIMS_JVMTIEXPORT_HPP 26 #define SHARE_PRIMS_JVMTIEXPORT_HPP 27 28 #include "jvmtifiles/jvmti.h" 29 #include "memory/allocation.hpp" 30 #include "memory/iterator.hpp" 31 #include "oops/oop.hpp" 32 #include "oops/oopsHierarchy.hpp" 33 #include "runtime/frame.hpp" 34 #include "runtime/handles.hpp" 35 #include "utilities/globalDefinitions.hpp" 36 #include "utilities/growableArray.hpp" 37 #include "utilities/macros.hpp" 38 39 // Must be included after jvmti.h. 40 #include "jvmticmlr.h" 41 42 // Forward declarations 43 44 class JvmtiEventControllerPrivate; 45 class JvmtiManageCapabilities; 46 class JvmtiEnv; 47 class JvmtiThreadState; 48 49 #define JVMTI_SUPPORT_FLAG(key) \ 50 private: \ 51 static bool _##key; \ 52 public: \ 53 inline static void set_##key(bool on) { \ 54 JVMTI_ONLY(_##key = (on != 0)); \ 55 NOT_JVMTI(report_unsupported(on)); \ 56 } \ 57 inline static bool key() { \ 58 JVMTI_ONLY(return _##key); \ 59 NOT_JVMTI(return false); \ 60 } 61 62 63 // This class contains the JVMTI interface for the rest of hotspot. 64 // 65 class JvmtiExport : public AllStatic { 66 friend class VMStructs; 67 friend class CompileReplay; 68 69 private: 70 71 #if INCLUDE_JVMTI 72 static int _field_access_count; 73 static int _field_modification_count; 74 75 static bool _can_access_local_variables; 76 static bool _can_hotswap_or_post_breakpoint; 77 static bool _can_modify_any_class; 78 static bool _can_walk_any_space; 79 #endif // INCLUDE_JVMTI 80 81 JVMTI_SUPPORT_FLAG(can_get_source_debug_extension) 82 JVMTI_SUPPORT_FLAG(can_maintain_original_method_order) 83 JVMTI_SUPPORT_FLAG(can_post_interpreter_events) 84 JVMTI_SUPPORT_FLAG(can_post_on_exceptions) 85 JVMTI_SUPPORT_FLAG(can_post_breakpoint) 86 JVMTI_SUPPORT_FLAG(can_post_field_access) 87 JVMTI_SUPPORT_FLAG(can_post_field_modification) 88 JVMTI_SUPPORT_FLAG(can_post_method_entry) 89 JVMTI_SUPPORT_FLAG(can_post_method_exit) 90 JVMTI_SUPPORT_FLAG(can_pop_frame) 91 JVMTI_SUPPORT_FLAG(can_force_early_return) 92 93 JVMTI_SUPPORT_FLAG(early_vmstart_recorded) 94 95 friend class JvmtiEventControllerPrivate; // should only modify these flags 96 JVMTI_SUPPORT_FLAG(should_post_single_step) 97 JVMTI_SUPPORT_FLAG(should_post_field_access) 98 JVMTI_SUPPORT_FLAG(should_post_field_modification) 99 JVMTI_SUPPORT_FLAG(should_post_class_load) 100 JVMTI_SUPPORT_FLAG(should_post_class_prepare) 101 JVMTI_SUPPORT_FLAG(should_post_class_unload) 102 JVMTI_SUPPORT_FLAG(should_post_native_method_bind) 103 JVMTI_SUPPORT_FLAG(should_post_compiled_method_load) 104 JVMTI_SUPPORT_FLAG(should_post_compiled_method_unload) 105 JVMTI_SUPPORT_FLAG(should_post_dynamic_code_generated) 106 JVMTI_SUPPORT_FLAG(should_post_monitor_contended_enter) 107 JVMTI_SUPPORT_FLAG(should_post_monitor_contended_entered) 108 JVMTI_SUPPORT_FLAG(should_post_monitor_wait) 109 JVMTI_SUPPORT_FLAG(should_post_monitor_waited) 110 JVMTI_SUPPORT_FLAG(should_post_data_dump) 111 JVMTI_SUPPORT_FLAG(should_post_garbage_collection_start) 112 JVMTI_SUPPORT_FLAG(should_post_garbage_collection_finish) 113 JVMTI_SUPPORT_FLAG(should_post_on_exceptions) 114 115 // ------ the below maybe don't have to be (but are for now) 116 // fixed conditions here ------------ 117 // any events can be enabled 118 JVMTI_SUPPORT_FLAG(should_post_thread_life) 119 JVMTI_SUPPORT_FLAG(should_post_object_free) 120 JVMTI_SUPPORT_FLAG(should_post_resource_exhausted) 121 122 // we are holding objects on the heap - need to talk to GC - e.g. 123 // breakpoint info 124 JVMTI_SUPPORT_FLAG(should_clean_up_heap_objects) 125 JVMTI_SUPPORT_FLAG(should_post_vm_object_alloc) 126 JVMTI_SUPPORT_FLAG(should_post_sampled_object_alloc) 127 128 // If flag cannot be implemented, give an error if on=true 129 static void report_unsupported(bool on); 130 131 // these should only be called by the friend class 132 friend class JvmtiManageCapabilities; 133 inline static void set_can_modify_any_class(bool on) { 134 JVMTI_ONLY(_can_modify_any_class = (on != 0);) 135 } 136 inline static void set_can_access_local_variables(bool on) { 137 JVMTI_ONLY(_can_access_local_variables = (on != 0);) 138 } 139 inline static void set_can_hotswap_or_post_breakpoint(bool on) { 140 JVMTI_ONLY(_can_hotswap_or_post_breakpoint = (on != 0);) 141 } 142 inline static void set_can_walk_any_space(bool on) { 143 JVMTI_ONLY(_can_walk_any_space = (on != 0);) 144 } 145 146 enum { 147 JVMTI_VERSION_MASK = 0x70000000, 148 JVMTI_VERSION_VALUE = 0x30000000, 149 JVMDI_VERSION_VALUE = 0x20000000 150 }; 151 152 static void post_field_modification(JavaThread *thread, Method* method, address location, 153 Klass* field_klass, Handle object, jfieldID field, 154 char sig_type, jvalue *value); 155 156 157 // posts a DynamicCodeGenerated event (internal/private implementation). 158 // The public post_dynamic_code_generated* functions make use of the 159 // internal implementation. Also called from JvmtiDeferredEvent::post() 160 static void post_dynamic_code_generated_internal(const char *name, const void *code_begin, const void *code_end) NOT_JVMTI_RETURN; 161 162 private: 163 164 // GenerateEvents support to allow posting of CompiledMethodLoad and 165 // DynamicCodeGenerated events for a given environment. 166 friend class JvmtiCodeBlobEvents; 167 168 static void post_compiled_method_load(JvmtiEnv* env, nmethod *nm) NOT_JVMTI_RETURN; 169 static void post_dynamic_code_generated(JvmtiEnv* env, const char *name, const void *code_begin, 170 const void *code_end) NOT_JVMTI_RETURN; 171 172 // This flag indicates whether RedefineClasses() has ever redefined 173 // one or more classes during the lifetime of the VM. The flag should 174 // only be set by the friend class and can be queried by other sub 175 // systems as needed to relax invariant checks. 176 static int _redefinition_count; 177 friend class VM_RedefineClasses; 178 inline static void increment_redefinition_count() { 179 JVMTI_ONLY(_redefinition_count++;) 180 } 181 // Flag to indicate if the compiler has recorded all dependencies. When the 182 // can_redefine_classes capability is enabled in the OnLoad phase then the compiler 183 // records all dependencies from startup. However if the capability is first 184 // enabled some time later then the dependencies recorded by the compiler 185 // are incomplete. This flag is used by RedefineClasses to know if the 186 // dependency information is complete or not. 187 static bool _all_dependencies_are_recorded; 188 189 public: 190 inline static bool has_redefined_a_class() { 191 JVMTI_ONLY(return _redefinition_count != 0); 192 NOT_JVMTI(return false); 193 } 194 195 // Only set in safepoint, so no memory ordering needed. 196 inline static int redefinition_count() { return _redefinition_count; } 197 198 // Set by ciReplay 199 inline static void set_redefinition_count(int value) { _redefinition_count = value; } 200 201 inline static bool all_dependencies_are_recorded() { 202 return _all_dependencies_are_recorded; 203 } 204 205 inline static void set_all_dependencies_are_recorded(bool on) { 206 _all_dependencies_are_recorded = (on != 0); 207 } 208 209 // Add read edges to the unnamed modules of the bootstrap and app class loaders 210 static void add_default_read_edges(Handle h_module, TRAPS) NOT_JVMTI_RETURN; 211 212 // Add a read edge to the module 213 static jvmtiError add_module_reads(Handle module, Handle to_module, TRAPS); 214 215 // Updates a module to export a package 216 static jvmtiError add_module_exports(Handle module, Handle pkg_name, Handle to_module, TRAPS); 217 218 // Updates a module to open a package 219 static jvmtiError add_module_opens(Handle module, Handle pkg_name, Handle to_module, TRAPS); 220 221 // Add a used service to the module 222 static jvmtiError add_module_uses(Handle module, Handle service, TRAPS); 223 224 // Add a service provider to the module 225 static jvmtiError add_module_provides(Handle module, Handle service, Handle impl_class, TRAPS); 226 227 // let JVMTI know that the JVM_OnLoad code is running 228 static void enter_onload_phase() NOT_JVMTI_RETURN; 229 230 // let JVMTI know that the VM isn't up yet (and JVM_OnLoad code isn't running) 231 static void enter_primordial_phase() NOT_JVMTI_RETURN; 232 233 // let JVMTI know that the VM isn't up yet but JNI is live 234 static void enter_early_start_phase() NOT_JVMTI_RETURN; 235 static void enter_start_phase() NOT_JVMTI_RETURN; 236 237 // let JVMTI know that the VM is fully up and running now 238 static void enter_live_phase() NOT_JVMTI_RETURN; 239 240 // ------ can_* conditions (below) are set at OnLoad and never changed ------------ 241 inline static bool can_modify_any_class() { 242 JVMTI_ONLY(return _can_modify_any_class); 243 NOT_JVMTI(return false); 244 } 245 inline static bool can_access_local_variables() { 246 JVMTI_ONLY(return _can_access_local_variables); 247 NOT_JVMTI(return false); 248 } 249 inline static bool can_hotswap_or_post_breakpoint() { 250 JVMTI_ONLY(return _can_hotswap_or_post_breakpoint); 251 NOT_JVMTI(return false); 252 } 253 inline static bool can_walk_any_space() { 254 JVMTI_ONLY(return _can_walk_any_space); 255 NOT_JVMTI(return false); 256 } 257 258 // field access management 259 static address get_field_access_count_addr() NOT_JVMTI_RETURN_(0); 260 261 // field modification management 262 static address get_field_modification_count_addr() NOT_JVMTI_RETURN_(0); 263 264 // ----------------- 265 266 static bool is_jvmti_version(jint version) { 267 JVMTI_ONLY(return (version & JVMTI_VERSION_MASK) == JVMTI_VERSION_VALUE); 268 NOT_JVMTI(return false); 269 } 270 static bool is_jvmdi_version(jint version) { 271 JVMTI_ONLY(return (version & JVMTI_VERSION_MASK) == JVMDI_VERSION_VALUE); 272 NOT_JVMTI(return false); 273 } 274 static jint get_jvmti_interface(JavaVM *jvm, void **penv, jint version) NOT_JVMTI_RETURN_(0); 275 static void decode_version_values(jint version, int * major, int * minor, 276 int * micro) NOT_JVMTI_RETURN; 277 278 // single stepping management methods 279 static void at_single_stepping_point(JavaThread *thread, Method* method, address location) NOT_JVMTI_RETURN; 280 static void expose_single_stepping(JavaThread *thread) NOT_JVMTI_RETURN; 281 static bool hide_single_stepping(JavaThread *thread) NOT_JVMTI_RETURN_(false); 282 283 // Methods that notify the debugger that something interesting has happened in the VM. 284 static void post_early_vm_start () NOT_JVMTI_RETURN; 285 static void post_vm_start () NOT_JVMTI_RETURN; 286 static void post_vm_initialized () NOT_JVMTI_RETURN; 287 static void post_vm_death () NOT_JVMTI_RETURN; 288 289 static void post_single_step (JavaThread *thread, Method* method, address location) NOT_JVMTI_RETURN; 290 static void post_raw_breakpoint (JavaThread *thread, Method* method, address location) NOT_JVMTI_RETURN; 291 292 static void post_exception_throw (JavaThread *thread, Method* method, address location, oop exception) NOT_JVMTI_RETURN; 293 static void notice_unwind_due_to_exception (JavaThread *thread, Method* method, address location, oop exception, bool in_handler_frame) NOT_JVMTI_RETURN; 294 295 static oop jni_GetField_probe (JavaThread *thread, jobject jobj, 296 oop obj, Klass* klass, jfieldID fieldID, bool is_static) 297 NOT_JVMTI_RETURN_(NULL); 298 static oop jni_GetField_probe_nh (JavaThread *thread, jobject jobj, 299 oop obj, Klass* klass, jfieldID fieldID, bool is_static) 300 NOT_JVMTI_RETURN_(NULL); 301 static void post_field_access_by_jni (JavaThread *thread, oop obj, 302 Klass* klass, jfieldID fieldID, bool is_static) NOT_JVMTI_RETURN; 303 static void post_field_access (JavaThread *thread, Method* method, 304 address location, Klass* field_klass, Handle object, jfieldID field) NOT_JVMTI_RETURN; 305 static oop jni_SetField_probe (JavaThread *thread, jobject jobj, 306 oop obj, Klass* klass, jfieldID fieldID, bool is_static, char sig_type, 307 jvalue *value) NOT_JVMTI_RETURN_(NULL); 308 static oop jni_SetField_probe_nh (JavaThread *thread, jobject jobj, 309 oop obj, Klass* klass, jfieldID fieldID, bool is_static, char sig_type, 310 jvalue *value) NOT_JVMTI_RETURN_(NULL); 311 static void post_field_modification_by_jni(JavaThread *thread, oop obj, 312 Klass* klass, jfieldID fieldID, bool is_static, char sig_type, 313 jvalue *value); 314 static void post_raw_field_modification(JavaThread *thread, Method* method, 315 address location, Klass* field_klass, Handle object, jfieldID field, 316 char sig_type, jvalue *value) NOT_JVMTI_RETURN; 317 318 static void post_method_entry (JavaThread *thread, Method* method, frame current_frame) NOT_JVMTI_RETURN; 319 static void post_method_exit (JavaThread *thread, Method* method, frame current_frame) NOT_JVMTI_RETURN; 320 321 static void post_class_load (JavaThread *thread, Klass* klass) NOT_JVMTI_RETURN; 322 static void post_class_unload (Klass* klass) NOT_JVMTI_RETURN; 323 static void post_class_prepare (JavaThread *thread, Klass* klass) NOT_JVMTI_RETURN; 324 325 static void post_thread_start (JavaThread *thread) NOT_JVMTI_RETURN; 326 static void post_thread_end (JavaThread *thread) NOT_JVMTI_RETURN; 327 328 // Support for java.lang.instrument agent loading. 329 static bool _should_post_class_file_load_hook; 330 inline static void set_should_post_class_file_load_hook(bool on) { _should_post_class_file_load_hook = on; } 331 inline static bool should_post_class_file_load_hook() { 332 JVMTI_ONLY(return _should_post_class_file_load_hook); 333 NOT_JVMTI(return false;) 334 } 335 static bool is_early_phase() NOT_JVMTI_RETURN_(false); 336 static bool has_early_class_hook_env() NOT_JVMTI_RETURN_(false); 337 // Return true if the class was modified by the hook. 338 static bool post_class_file_load_hook(Symbol* h_name, Handle class_loader, 339 Handle h_protection_domain, 340 unsigned char **data_ptr, unsigned char **end_ptr, 341 JvmtiCachedClassFileData **cache_ptr) NOT_JVMTI_RETURN_(false); 342 static void post_native_method_bind(Method* method, address* function_ptr) NOT_JVMTI_RETURN; 343 static void post_compiled_method_load(nmethod *nm) NOT_JVMTI_RETURN; 344 static void post_dynamic_code_generated(const char *name, const void *code_begin, const void *code_end) NOT_JVMTI_RETURN; 345 346 // used to post a CompiledMethodUnload event 347 static void post_compiled_method_unload(jmethodID mid, const void *code_begin) NOT_JVMTI_RETURN; 348 349 // similiar to post_dynamic_code_generated except that it can be used to 350 // post a DynamicCodeGenerated event while holding locks in the VM. Any event 351 // posted using this function is recorded by the enclosing event collector 352 // -- JvmtiDynamicCodeEventCollector. 353 static void post_dynamic_code_generated_while_holding_locks(const char* name, address code_begin, address code_end) NOT_JVMTI_RETURN; 354 355 static void post_garbage_collection_finish() NOT_JVMTI_RETURN; 356 static void post_garbage_collection_start() NOT_JVMTI_RETURN; 357 static void post_data_dump() NOT_JVMTI_RETURN; 358 static void post_monitor_contended_enter(JavaThread *thread, ObjectMonitor *obj_mntr) NOT_JVMTI_RETURN; 359 static void post_monitor_contended_entered(JavaThread *thread, ObjectMonitor *obj_mntr) NOT_JVMTI_RETURN; 360 static void post_monitor_wait(JavaThread *thread, oop obj, jlong timeout) NOT_JVMTI_RETURN; 361 static void post_monitor_waited(JavaThread *thread, ObjectMonitor *obj_mntr, jboolean timed_out) NOT_JVMTI_RETURN; 362 static void post_object_free(JvmtiEnv* env, jlong tag) NOT_JVMTI_RETURN; 363 static void post_resource_exhausted(jint resource_exhausted_flags, const char* detail) NOT_JVMTI_RETURN; 364 static void record_vm_internal_object_allocation(oop object) NOT_JVMTI_RETURN; 365 // Post objects collected by vm_object_alloc_event_collector. 366 static void post_vm_object_alloc(JavaThread *thread, oop object) NOT_JVMTI_RETURN; 367 // Collects vm internal objects for later event posting. 368 inline static void vm_object_alloc_event_collector(oop object) { 369 if (should_post_vm_object_alloc()) { 370 record_vm_internal_object_allocation(object); 371 } 372 } 373 374 static void record_sampled_internal_object_allocation(oop object) NOT_JVMTI_RETURN; 375 // Post objects collected by sampled_object_alloc_event_collector. 376 static void post_sampled_object_alloc(JavaThread *thread, oop object) NOT_JVMTI_RETURN; 377 378 // Collects vm internal objects for later event posting. 379 inline static void sampled_object_alloc_event_collector(oop object) { 380 if (should_post_sampled_object_alloc()) { 381 record_sampled_internal_object_allocation(object); 382 } 383 } 384 385 inline static void post_array_size_exhausted() { 386 if (should_post_resource_exhausted()) { 387 post_resource_exhausted(JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR, 388 "Requested array size exceeds VM limit"); 389 } 390 } 391 392 static void cleanup_thread (JavaThread* thread) NOT_JVMTI_RETURN; 393 static void clear_detected_exception (JavaThread* thread) NOT_JVMTI_RETURN; 394 395 static void oops_do(OopClosure* f) NOT_JVMTI_RETURN; 396 static void weak_oops_do(BoolObjectClosure* b, OopClosure* f) NOT_JVMTI_RETURN; 397 398 static void transition_pending_onload_raw_monitors() NOT_JVMTI_RETURN; 399 400 #if INCLUDE_SERVICES 401 // attach support 402 static jint load_agent_library(const char *agent, const char *absParam, const char *options, outputStream* out) NOT_JVMTI_RETURN_(JNI_ERR); 403 #endif 404 405 // SetNativeMethodPrefix support 406 static char** get_all_native_method_prefixes(int* count_ptr) NOT_JVMTI_RETURN_(NULL); 407 408 // JavaThread lifecycle support: 409 static jvmtiError cv_external_thread_to_JavaThread(ThreadsList * t_list, 410 jthread thread, 411 JavaThread ** jt_pp, 412 oop * thread_oop_p); 413 static jvmtiError cv_oop_to_JavaThread(ThreadsList * t_list, oop thread_oop, 414 JavaThread ** jt_pp); 415 }; 416 417 // Support class used by JvmtiDynamicCodeEventCollector and others. It 418 // describes a single code blob by name and address range. 419 class JvmtiCodeBlobDesc : public CHeapObj<mtInternal> { 420 private: 421 char _name[64]; 422 address _code_begin; 423 address _code_end; 424 425 public: 426 JvmtiCodeBlobDesc(const char *name, address code_begin, address code_end) { 427 assert(name != NULL, "all code blobs must be named"); 428 strncpy(_name, name, sizeof(_name) - 1); 429 _name[sizeof(_name)-1] = '\0'; 430 _code_begin = code_begin; 431 _code_end = code_end; 432 } 433 char* name() { return _name; } 434 address code_begin() { return _code_begin; } 435 address code_end() { return _code_end; } 436 }; 437 438 // JvmtiEventCollector is a helper class to setup thread for 439 // event collection. 440 class JvmtiEventCollector : public StackObj { 441 private: 442 JvmtiEventCollector* _prev; // Save previous one to support nested event collector. 443 bool _unset_jvmti_thread_state; 444 445 public: 446 JvmtiEventCollector() : _prev(NULL), _unset_jvmti_thread_state(false) {} 447 448 void setup_jvmti_thread_state(); // Set this collector in current thread, returns if success. 449 void unset_jvmti_thread_state(); // Reset previous collector in current thread. 450 virtual bool is_dynamic_code_event() { return false; } 451 virtual bool is_vm_object_alloc_event(){ return false; } 452 virtual bool is_sampled_object_alloc_event(){ return false; } 453 JvmtiEventCollector *get_prev() { return _prev; } 454 }; 455 456 // A JvmtiDynamicCodeEventCollector is a helper class for the JvmtiExport 457 // interface. It collects "dynamic code generated" events that are posted 458 // while holding locks. When the event collector goes out of scope the 459 // events will be posted. 460 // 461 // Usage :- 462 // 463 // { 464 // JvmtiDynamicCodeEventCollector event_collector; 465 // : 466 // { MutexLocker ml(...) 467 // : 468 // JvmtiExport::post_dynamic_code_generated_while_holding_locks(...) 469 // } 470 // // event collector goes out of scope => post events to profiler. 471 // } 472 473 class JvmtiDynamicCodeEventCollector : public JvmtiEventCollector { 474 private: 475 GrowableArray<JvmtiCodeBlobDesc*>* _code_blobs; // collected code blob events 476 477 friend class JvmtiExport; 478 void register_stub(const char* name, address start, address end); 479 480 public: 481 JvmtiDynamicCodeEventCollector() NOT_JVMTI_RETURN; 482 ~JvmtiDynamicCodeEventCollector() NOT_JVMTI_RETURN; 483 bool is_dynamic_code_event() { return true; } 484 485 }; 486 487 // Used as a base class for object allocation collection and then posting 488 // the allocations to any event notification callbacks. 489 // 490 class JvmtiObjectAllocEventCollector : public JvmtiEventCollector { 491 protected: 492 GrowableArray<oop>* _allocated; // field to record collected allocated object oop. 493 bool _enable; // This flag is enabled in constructor if set up in the thread state 494 // and disabled in destructor before posting event. To avoid 495 // collection of objects allocated while running java code inside 496 // agent post_X_object_alloc() event handler. 497 void (*_post_callback)(JavaThread*, oop); // what callback to use when destroying the collector. 498 499 //GC support 500 void oops_do(OopClosure* f); 501 502 friend class JvmtiExport; 503 504 // Record allocated object oop. 505 inline void record_allocation(oop obj); 506 507 //GC support 508 static void oops_do_for_all_threads(OopClosure* f); 509 510 public: 511 JvmtiObjectAllocEventCollector() NOT_JVMTI_RETURN; 512 513 void generate_call_for_allocated(); 514 515 bool is_enabled() { return _enable; } 516 void set_enabled(bool on) { _enable = on; } 517 }; 518 519 // Used to record vm internally allocated object oops and post 520 // vm object alloc event for objects visible to java world. 521 // Constructor enables JvmtiThreadState flag and all vm allocated 522 // objects are recorded in a growable array. When destructor is 523 // called the vm object alloc event is posted for each object 524 // visible to java world. 525 // See jvm.cpp file for its usage. 526 // 527 class JvmtiVMObjectAllocEventCollector : public JvmtiObjectAllocEventCollector { 528 public: 529 JvmtiVMObjectAllocEventCollector() NOT_JVMTI_RETURN; 530 ~JvmtiVMObjectAllocEventCollector() NOT_JVMTI_RETURN; 531 virtual bool is_vm_object_alloc_event() { return true; } 532 }; 533 534 // Used to record sampled allocated object oops and post 535 // sampled object alloc event. 536 // Constructor enables JvmtiThreadState flag and all sampled allocated 537 // objects are recorded in a growable array. When destructor is 538 // called the sampled object alloc event is posted for each sampled object. 539 // See jvm.cpp file for its usage. 540 // 541 class JvmtiSampledObjectAllocEventCollector : public JvmtiObjectAllocEventCollector { 542 public: 543 JvmtiSampledObjectAllocEventCollector() NOT_JVMTI_RETURN; 544 ~JvmtiSampledObjectAllocEventCollector() NOT_JVMTI_RETURN; 545 bool is_sampled_object_alloc_event() { return true; } 546 static bool object_alloc_is_safe_to_sample() NOT_JVMTI_RETURN_(false); 547 }; 548 549 // Marker class to disable the posting of VMObjectAlloc events 550 // within its scope. 551 // 552 // Usage :- 553 // 554 // { 555 // NoJvmtiVMObjectAllocMark njm; 556 // : 557 // // VMObjAlloc event will not be posted 558 // JvmtiExport::vm_object_alloc_event_collector(obj); 559 // : 560 // } 561 562 class NoJvmtiVMObjectAllocMark : public StackObj { 563 private: 564 // enclosing collector if enabled, NULL otherwise 565 JvmtiVMObjectAllocEventCollector *_collector; 566 567 bool was_enabled() { return _collector != NULL; } 568 569 public: 570 NoJvmtiVMObjectAllocMark() NOT_JVMTI_RETURN; 571 ~NoJvmtiVMObjectAllocMark() NOT_JVMTI_RETURN; 572 }; 573 574 575 // Base class for reporting GC events to JVMTI. 576 class JvmtiGCMarker : public StackObj { 577 public: 578 JvmtiGCMarker() NOT_JVMTI_RETURN; 579 ~JvmtiGCMarker() NOT_JVMTI_RETURN; 580 }; 581 582 // JvmtiHideSingleStepping is a helper class for hiding 583 // internal single step events. 584 class JvmtiHideSingleStepping : public StackObj { 585 private: 586 bool _single_step_hidden; 587 JavaThread * _thread; 588 589 public: 590 JvmtiHideSingleStepping(JavaThread * thread) { 591 assert(thread != NULL, "sanity check"); 592 593 _single_step_hidden = false; 594 _thread = thread; 595 if (JvmtiExport::should_post_single_step()) { 596 _single_step_hidden = JvmtiExport::hide_single_stepping(_thread); 597 } 598 } 599 600 ~JvmtiHideSingleStepping() { 601 if (_single_step_hidden) { 602 JvmtiExport::expose_single_stepping(_thread); 603 } 604 } 605 }; 606 607 #endif // SHARE_PRIMS_JVMTIEXPORT_HPP